KR20220029031A - Apparatus to store image for cctv and method to store image using the same - Google Patents

Abstract

An embodiment of the present invention relates to an image storage device for a CCTV and an image storage method using the same. A technical purpose to be solved is to save a high-definition image in a relatively small hard disk capacity, and reduce installation and management costs. To this end, an embodiment of the present invention provides an image storage device for a CCTV for digitizing and storing an image signal captured by the CCTV through a built-in hard disk. An image storage device for a CCTV includes a signal processing means for separating the hard disk area and performing signal processing to distribute and store an image signal of a predetermined period and an image signal of generating an event among image signals captured by the CCTV.

Description

Video storage device for CCTV and video storage method using the same

An embodiment of the present invention relates to an image storage device for CCTV and an image storage method using the same.

In general, a closed circuit television (CCTV) called CCTV is installed in a place that requires monitoring. A video storage device for CCTV is connected to the video output terminal provided on one side of the CCTV, and the video signal captured by the CCTV can be converted into data and stored.

Meanwhile, with the transition from the analog era to the digital era, CCTV is gradually changing from an analog camera to a digital IP camera. The great advantage of IP cameras is that they have high quality, but the data to be stored also increases accordingly. For example, if 16 channels of Full HD video need to be stored for 3 months, the size of 8Mbps per channel is 16 channels * 8Mbps / 8 Byte * 60 seconds * 60 minutes * 24 hours * 30 days * 3 months = 124416GByte = 124TB, which requires a much larger capacity hard disk than before. In addition, building a 10TB HDD and building a 100TB HDD does not simply incur 10 times the cost, but incurs 20 to 30 times the cost, so using a small HDD is very cost-saving. is emerging as an important issue. Therefore, the development of an apparatus and method for efficiently storing CCTV images with a small hard disk capacity is required.

An embodiment of the present invention provides a video storage device for CCTV and an image storage method using the same, which can reduce installation and management costs by storing high-definition images with a relatively small hard disk capacity.

The video storage device for CCTV according to an embodiment of the present invention is a video storage device for CCTV for converting and storing video signals captured by CCTV through a built-in hard disk. It may include a signal processing means for processing the image signal of a predetermined period of the image signal taken by the signal processing so as to separately store and store the image signal in which the event is generated, respectively.

The signal processing means may include: a signal processing unit for each period which converts a video signal of a predetermined period among the video signals captured by the CCTV into data and stores it in a predetermined area of the hard disk; an event image determination unit for determining whether an event has occurred by analyzing the video signal captured by the CCTV; and an event signal processing unit for storing the original image of the image signal in which the event has occurred in the remaining area of the hard disk.

The event image determining unit may determine whether an event has occurred by analyzing a pattern of a moving object among the image signals captured by the CCTV.

The event image determining unit includes an event DB in which a preset event type is stored; an event type determination unit for determining a type of event by analyzing a pattern of a moving object among the video signals captured by the CCTV based on the event DB; an event time determination unit for determining a progress time of the determined event; and an event video compression setting unit that calculates parameters when decoding and recompressing the video signal captured by the CCTV based on the type and duration of the event.

The parameters may include resolution, frame rate, and bit rate.

The event signal processing unit may preset a storage time of the original image when an event occurs.

The storage time of the original image may be 10 to 20 seconds before and after the occurrence of the event.

The type of the event may be any one of intrusion, wandering, theft, neglect, virtual fence, people count, and parking and stopping detection.

In addition, in the video storage method for CCTV according to another embodiment of the present invention, in the video storage method for CCTV for storing the video signal captured by the CCTV through a built-in hard disk into data, the area of the hard disk is It may include a signal processing step of processing the signal so as to separately store the video signal of a predetermined period and the video signal in which the event has occurred among the video signals captured by the CCTV separately.

The signal processing step may include: a signal processing process for each period of converting a video signal of a predetermined period among the video signals captured by the CCTV into data and storing it in a predetermined area of the hard disk; an event image determination process of determining whether an event has occurred by analyzing the video signal captured by the CCTV; and an event signal processing process of storing the original image of the image signal in which the event has occurred in the remaining area of the hard disk.

The event image determination process may determine whether an event has occurred by analyzing a pattern of a moving object among the image signals captured by the CCTV.

The event image determination process may include: an event type determination process of determining the type of event by analyzing a pattern of a moving object among the video signals captured by the CCTV based on an event DB in which a preset event type is stored; an event time determination process of determining a progress time of the determined event; and an event video compression setting process of calculating parameters for decoding and recompressing the video signal captured by the CCTV based on the type and duration of the event.

The parameters may include resolution, frame rate, and bit rate.

The event signal processing process may further include a process of presetting a storage time of the original image when an event occurs.

The storage time of the original image may be 10 to 20 seconds before and after the occurrence of the event.

The type of the event may be any one of intrusion, wandering, theft, neglect, virtual fence, people count, and parking and stopping detection.

The video storage device for CCTV and the video storage method using the same according to an embodiment of the present invention is a video signal and an event of a predetermined period among video signals captured by CCTV by separating an area of a hard disk when storing high-definition video. By distributing each video signal, it is possible to save high-definition video with a relatively small hard disk capacity, thereby reducing installation and management costs.

1 is a block diagram schematically showing the configuration of a video storage device for CCTV according to an embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of the signal processing means of FIG. 1 .
3 is a block diagram illustrating the event image determining unit of FIG. 2 .
4 is a flowchart illustrating a method for storing an image for CCTV according to another embodiment of the present invention.
5 is a flowchart illustrating an event image determination process of FIG. 4 .

A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings to the extent that a person of ordinary skill in the art to which the present invention pertains can easily practice the present invention.

1 is a block diagram schematically showing the configuration of a video storage device for CCTV according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of the signal processing means of FIG. 1, and FIG. 3 is the event of FIG. It is a block diagram showing the image judgment unit.

1 to 3, the video storage device 10 for CCTV according to an embodiment of the present invention is connected to the video output terminal 1a of the CCTV 1 through a cable, and a built-in hard disk (HDD) ), a device for storing the video signal captured by the CCTV (1) into data, and a video signal of a predetermined period and an event occurring among the video signals captured by the CCTV (1) by separating the hard disk area. and signal processing means 100 for processing the signals so as to store the signals in a distributed manner.

The signal processing unit 100 includes a signal processing unit 110 for each period, an event image determining unit 120 , and an event signal processing unit 130 .

The signal processing unit 110 for each period converts the image signal of a predetermined period among the image signals captured by the CCTV 1 into data and stores it in a predetermined area of the hard disk.

The event image determining unit 120 analyzes the video signal captured by the CCTV 1 to determine whether an event has occurred.

That is, the event image determining unit 120 determines whether an event occurs by analyzing a pattern of a moving object among the image signals captured by the CCTV.

The event image determining unit 120 includes an event DB 121 , an event type determining unit 122 , an event time determining unit 123 , and an image compression setting unit 124 .

The event DB 121 is a memory device in which a preset event type is stored.

The event type determining unit 122 determines the type of event by analyzing a pattern of a moving object among the video signals captured by the CCTV 1 based on the event DB 121 . The type of the event may be any one of intrusion, wandering, theft, neglect, virtual fence, people count, and parking and stopping detection.

The event time determination unit 123 determines the duration of the event determined by the event type determination unit 122 .

The video compression setting unit 124 calculates parameters when decoding and recompressing the video signal captured by the CCTV 1 based on the type of event and the duration of the event. The parameters include resolution, frame rate, and bit rate.

The event signal processing unit 130 stores the original image of the image signal in which the event has occurred in the remaining area of the hard disk. In addition, in the event signal processing unit 130, when an event occurs, the storage time of the original image is preset.

For example, the storage time of the original image may be 10 to 20 seconds before and after the occurrence of the event.

To describe the operation of the signal processing means 100 of the video storage device 10 for CCTV according to an embodiment of the present invention configured as described above in more detail, first, there are 16 Full HD IP cameras and a Full HD IP camera. It is assumed that the image captured by the is being transmitted at 8 Mbps in order to store it in high quality. At this time, in order to store the images captured by the Full HD IP camera for 3 months (90 days), a large capacity HDD of about 124 TB is required. However, in the present invention, the image captured by the Full HD IP camera can be stored in 12TB by using the CCTV image storage device 10 . 12TB is a capacity using 4 HDDs of 3TB used in recent PCs, and can be built at a low cost.

Hereinafter, it is assumed that the video storage device 10 for CCTV according to an embodiment of the present invention has a 12TB HDD and a signal processing means 100, and the operation of the signal processing means 100 will be described. do.

First, the video storage device 10 for CCTV stores the latest full HD video of 6TB, which is half of the HDD of 12TB, through the signal processing unit 110 for each period of the signal processing means 100 .

16 channels * 8Mbps/8byte * X seconds = 6,000,000 Mbyte

(X is 375000 seconds, about 104 hours or about 4 days and 8 hours)

Four days calculated as above would be sufficient time for an event to occur and confirm.

In addition, the remaining 6TB of the HDD of 12TB built in the video storage device 10 for CCTV is analyzed through the intelligent video using the event video determination unit 120 of the signal processing means 100 . Here, the intelligent image is a technology that generates an event by analyzing patterns of moving people and objects. For example, if there is a moving person, you can track that person, and you can set the moving time, etc., and trigger an event only when the person moves continuously during that time.

Also included are events in which objects and objects suddenly appear or disappear, or faces are detected.

In this case, the event image determining unit 120 of the signal processing means 10 may utilize the remaining 6TB by using a plurality of parameters. The parameters include resolution, frame rate, and bit rate when decoding and recompressing an image. Several of these three parameters can be set in stages. In an example to be described later, it is also possible to automatically obtain an optimal value without writing down these three parameters. In addition, the event image determination unit 120 of the signal processing means 10 sets an intelligent algorithm. In this case, the original image is preserved for the event. In addition, the type of the event may include intrusion, wandering, theft, neglect, virtual fence, face detection, people count, parking and stopping detection, camera disablement, and the like.

In addition, the event image determining unit 120 sets time information corresponding to each algorithm (eg, loitering time in the case of loitering), and stores the original image when an event occurs (eg, 10 seconds before and after the event) ) can be set. The image that has undergone such a process is stored in the remaining 6TB through the event signal processing unit 130 of the present signal processing means 100 .

To explain more specifically, it is assumed that the remaining 86 days are stored using the remaining 6TB. At this time, to store 86 days, the average bitrate can be calculated as follows.

16 channels * X Mbps/8byte * 3600 seconds * 24 * 86 = 6,000,000 Mbyte

(here, X is 0.404Mbps→404Kbps)

404kbps is a number that guarantees some degree of quality when D1 video is saved at 10f/s and QVGA video is saved at 30f/s.

According to this, assuming that a 404kbps video is stored as a D1 video at 10F/sf for 1 month, and the rest period is stored as a QVGA video at 10F/s, about 3TB is created as follows, and 3TB of free space is created.

16ch * 0.40416Mbps / 8byte * 3600sec *24*30 + 16ch *0.404Mbps/8byte / 4 (size)* 3600sec * 24 *56 days = 2,094,336Mbyte + 977,356Mbyte = 3,071,692Mbyte

This free space can be used as a space to store the original image of the intelligent algorithm.

In addition, the free space of 3 TB as described above is 206250 / 20 = 9375 per channel, 9375 / 16 = 585 per channel, assuming that 8 Mbps of full HD video is created as follows: If it is 86 days, 7 alarms are generated per day.

16 channels * 8Mbps / 8byte 　* X seconds = 3,000,000Mbyte = 187500 seconds.

Therefore, if the parameter values are designated as described above, the resolution, frame rate, and image quality can be automatically set.

To describe the parameter values in detail, the values constituting the parameters are as follows.

Total hard disk capacity: A Byte

Hard disk capacity to store the original video: B Byte

Hard capacity to store after decoding and re-encoding: C Byte

Original video to be saved as event: D Byte

Bitrate of original video: E bps (per channel)

Resolution to decode and re-encode again: F (F1, F2 (step by step)) (HD, D1, QVGA, etc.)

Bitrate to decode and re-encode: G (G1, G2 bps (step by step))

Frame rate to be decoded and re-encoded: H (H1, H2 f/s (step by step))

(Here, it is assumed that there are only two steps, but the number is not limited thereto and may be more)

Time to save the entire image (in seconds): I s

Time to save the original image in seconds: J s

Time to decode and re-encode and save (seconds): K (K1, K2 s (step by step))

Number of channels in the camera: L

Accordingly, the parameters to be automatically obtained are C, E, G, and H.

For this purpose, if A, B, F, I, J, K, and F are input first, C, E, G, and H are optimized and automatically determined.

On the other hand, D is determined by the event.

The formula is:

C = A - (B + D)

E = B *8 / (L*I) bps

G1　= K1*8 / (L*J) bps

G2 = K2*8 / (L*J) bps

K1 + K2 = K

When F is HD (4Mbps quality), H = 30 * G / 4M,

When F is D1 (1Mbps quality), H = 30 * G / 1M,

When F is QVGA (0.25Mbp quality), H = 30 * G / 0.25M.

If F is HD, if G is 0.3Mbps, H = 30*0.3/4 = 2.25 f/s,

If F is D1 and G is 0.3Mbps, H = 30*0.3 = 9 f/s,

If F is QVGA and G is 0.3Mbps, H = 30*0.3/0.25 = 30 f/s.

(Here, 30f/s or more is referred to as 30f/s)

The above equation corresponds to an example, and the equation is developed assuming that all channels have the same bit rate, and it will be possible with the equation even in different cases. Conversely, by entering the parameters A, C, D, E, G, H, K, F, B, I, and J can also be obtained.

The video storage device 10 for CCTV according to an embodiment of the present invention configured as described above can dramatically reduce the storage capacity that remarkably increases according to the high-definition video storage demand of the CCTV camera, and also stores the CCTV video in high-definition. while reducing the cost of storage devices.

4 is a flowchart illustrating an image storage method for CCTV according to another embodiment of the present invention, and FIG. 5 is a flowchart illustrating the event image determination process of FIG.

4 to 5, the video storage method for CCTV according to another embodiment of the present invention is a video storage method for CCTV for storing the video signal captured by CCTV through a built-in hard disk into data, and the hard disk It includes a signal processing step (S10) of dividing the disk area and processing the signal so as to distribute and store the video signal of a predetermined period of the video signal captured by the CCTV and the video signal in which an event has occurred, respectively.

The signal processing step (S10) includes a signal processing process for each period (S100) of converting a video signal of a predetermined period among the video signals captured by CCTV and storing it in a certain area of the hard disk, and analyzing the video signal captured by the CCTV. It includes an event image determination process (S110) of determining whether an event has occurred, and an event signal processing process (S120) of storing the original image of the image signal in which the event has occurred in the remaining area of the hard disk.

The event image determination process (S110) is a process of determining whether an event has occurred by analyzing a pattern of a moving object among image signals captured by CCTV.

This event image determination process (S110) is an event type determination process (S111) of determining the type of event by analyzing the pattern of a moving object among the video signals captured by the CCTV based on the event DB in which the preset event type is stored; The event time determination process (S112) of determining the progress time of the event determined in the event determination process, and the calculation of parameters when decoding and recompressing the video signal captured by CCTV based on the type and running time of the event and an event video compression setting process (S113). Here, the parameters include resolution, frame rate, and bit rate. In addition, the type of the event may be any one of intrusion, wandering, theft, neglect, virtual fence, people count, and parking and stopping detection.

In addition, the event signal processing step ( S120 ) may further include a step of presetting a storage time of the original image when an event occurs. Here, the storage time of the original image may be 10 to 20 seconds before and after the occurrence of the event.

Therefore, the video storage method for CCTV according to another embodiment of the present invention configured as described above can store and manage the video for a long period of time even with a small hard disk in storing a large-capacity high-definition CCTV video, and the event (that is, event), high-quality image data can be easily inquired.

On the other hand, the above-described video storage method for CCTV may be implemented in the form of a program command that can be executed through various computer means and recorded on a computer-readable recording medium. The recording medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the recording medium may be specially designed and configured for the present invention, or may be known and available to those skilled in the art of computer software. For example, the recording medium includes magnetic media such as hard disks, floppy disks and magnetic tapes, optical recording media such as CDROMs and DVDs, and magneto-optical media such as floppy disks. (magneto-optical media), and hardware devices specially configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine language codes such as those generated by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. Such hardware devices may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

Therefore, according to the video storage device for CCTV and the video storage method using the same according to an embodiment of the present invention, a video signal and an event of a predetermined period among video signals captured by the CCTV by separating the hard disk area when storing high-definition video By distributing the generated video signals, the high-definition video can be stored with a relatively small hard disk capacity, thereby reducing installation and management costs.

What has been described above is only one embodiment for implementing the image storage device for CCTV and the image storage method using the same according to the present invention, and the present invention is not limited to the above embodiment, but is claimed in the claims below. As such, it will be said that the technical spirit of the present invention exists to the extent that various modifications can be made by anyone with ordinary knowledge in the field to which the invention pertains without departing from the gist of the present invention.

1 is a block diagram schematically showing the configuration of a video storage device for CCTV according to an embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of the signal processing means of FIG. 1 .
3 is a block diagram illustrating the event image determining unit of FIG. 2 .
4 is a flowchart illustrating a method for storing an image for CCTV according to another embodiment of the present invention.
5 is a flowchart illustrating an event image determination process of FIG. 4 .

Claims (8)

In the video storage device for CCTV for storing video signals photographed by CCTV through a built-in hard disk into data, the video signals and events of a predetermined period among the video signals photographed by the CCTV by separating the area of the hard disk are stored. and signal processing means for processing the generated video signals to be distributed and stored, respectively, wherein the signal processing means converts video signals of a predetermined period among the video signals photographed by the CCTV into data and stores them in a certain area of the hard disk for each period signal processing unit; and an event image determining unit for determining whether an event occurs by analyzing the video signal captured by the CCTV, wherein the signal processing unit for each period stores images for a predetermined period based on the current time in a certain area of the hard disk, , The event image determining unit determines whether an event has occurred using the remaining area of the hard disk using a plurality of parameters, wherein the parameters include resolution, frame rate, and bit rate when decoding and recompressing the image. The signal processing means may further include an event signal processing unit for storing the original image of the image signal in which the event has occurred in the remaining area of the hard disk, wherein the event image determination unit stores a preset type of event. event DB; an event type determination unit for determining a type of event by analyzing a pattern of a moving object among the video signals captured by the CCTV based on the event DB; an event time determination unit for determining a progress time of the determined event; and an event image compression setting unit that calculates parameters for decoding and recompressing the video signal captured by the CCTV based on the type and duration of the event, wherein the event signal processing unit generates an image of the original image when an event occurs. Video storage device for CCTV, characterized in that the storage time is preset.
The video storage device for CCTV according to claim 1, wherein the event video determining unit determines whether an event occurs by analyzing a pattern of a moving object among the video signals captured by the CCTV.
The video storage device for CCTV according to claim 1, wherein the storage time of the original video is 10 to 20 seconds before and after the event occurs.
The video storage device for CCTV according to claim 1, wherein the type of event is any one of intrusion, wandering, theft, neglect, virtual fence, people count, and parking and stopping detection.
In the video storage method for CCTV for storing the video signal captured by CCTV through a built-in hard disk into data, the video signal and event of a predetermined period among the video signals captured by the CCTV by separating the area of the hard disk A signal processing step of signal processing so as to distribute and store the generated image signals, respectively;
The signal processing step may include: a signal processing process for each period of converting a video signal of a predetermined period among the video signals captured by the CCTV into data and storing it in a predetermined area of the hard disk; and an event image determination process of determining whether an event has occurred by analyzing the video signal captured by the CCTV, wherein the signal processing process for each period includes, in a predetermined area of the hard disk, an image for a predetermined period based on the current time. , and the event image determination process determines whether an event occurs using the remaining area of the hard disk using a plurality of parameters, wherein the parameters are resolution, frame rate, and bit when decoding and recompressing the image. rate, wherein the signal processing step further includes an event signal processing process of storing the original image of the image signal in which the event has occurred in the remaining area of the hard disk, wherein the event image judgment process is the CCTV an event type determination process of determining the type of event by analyzing a pattern of a moving object among the image signals captured by the , based on an event DB in which a preset event type is stored; an event time determination process of determining a progress time of the determined event; and an event video compression setting process of calculating parameters when decoding and recompressing the video signal captured by the CCTV based on the type and duration of the event, wherein the event signal processing process is Video storage method for CCTV, characterized in that it further comprises the step of setting the storage time of the video in advance.
[Claim 6] The method of claim 5, wherein the event image determination process determines whether an event has occurred by analyzing a pattern of a moving object among the image signals captured by the CCTV.
The method of claim 5, wherein the storage time of the original image is 10 to 20 seconds before and after the event occurs.
A computer-readable recording medium in which a program for executing the method according to any one of claims 5, 6, and 7 is recorded.

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